KR0128916Y1 - Low noise refrigerator - Google Patents

Abstract

The present invention relates to a refrigerator, and an object thereof is to minimize bubble generation and bubble noise and to recover liquid refrigerant and oil into the compressor without introducing the refrigerant into the compression chamber.

The evaporator 1 and the compressor 3 are connected by a refrigerant pipe, an accumulator 20 is installed at the outlet of the evaporator 1 and a muffler 40 is installed at the inlet of the compressor 3. The accumulator 20 includes an insertion tube 22 into which the outlet tube 11 of the evaporator 1 extends into the body 21, but the orifice is not formed in the insertion tube 22. The muffler 40 includes an inlet port 42 formed on the inlet side of the body 41 and an upper outlet port 43 and a lower outlet port 44 provided up and down on the outlet side. The upper outlet port 43 communicates with the compression chamber 34a of the compressor 3, and the lower outlet port 44 communicates with the free space 35 of the compressor 3.

Description

Low noise refrigerator

1 is a schematic configuration diagram of a general refrigerator.

2 is a view showing the structure between the accumulator and the compressor of the conventional refrigerator.

3 is a view showing a structure between the accumulator and the pressure gauge of the refrigerator according to the present invention.

4 is a cross-sectional view of the muffler of the refrigerator according to the present invention, and (b) is a side view thereof.

* Explanation of symbols for main parts of the drawings

20: Accumulator 21: Torso

22: insertion tube 22a: end

40: muffler 43; Upper Outflow Port

44: Lower oil flow port

The present invention relates to an electric refrigerator, and more particularly, to a low noise refrigerator that realizes low noise by improving the structure of an accumulator installed at an outlet of an evaporator of a refrigerator and a muffler installed at an inlet of a compressor.

Multifaceted research is underway for the quietness of home refrigerators. This is a significant progress through the improvement of the dustproof structure of the compressor, the cold circulation fan, the compressor cooling fan, and the refrigerant circulation pipe, which is the main noise source of the refrigerator. The characteristic of these creepy circles is that each of which is driven by a specific purpose or is generated in a portion directly connected to the drive, and generates airborne noise or structureborne noise.

On the other hand, the noise of the refrigerator is not limited to those described above, and noise generated when the compressor or the fan is stopped, for example, noise generated by bursting bubbles formed by the circulating refrigerant cannot be ignored. These noises are especially generated when the environment is quiet, which is very frustrating for consumers.

Referring to FIG. 1, an evaporator 1 is generally installed at the rear of the freezer compartment, and an accumulator 2 is installed at the outlet side of the evaporator 1. The pressure measuring device 3 is installed in the lower part of the main body. (4) is a fan for circulation of cold air, and (5) is a fan for cooling the compressor. The accumulator 2 is a safety device that prevents liquid refrigerant that has not been vaporized from the evaporator 1 from entering the suction pipe 31 and the compressor 3. That is, the reason why the accumulator 2 is installed at the outlet side of the evaporator 1 is that the liquid refrigerant flows into the suction pipe 31 to cause dew formation or the compressor 3 flows into the compressor 3 to overload the compressor 3. This can cause damage or cause large knocks.

2 is a view schematically illustrating a structure between an evaporator and a compressor of a conventional refrigerator. Referring to this, the accumulator 2 is installed at an angle to the evaporator 1 at an outlet side of the evaporator 1 and is inclined at a predetermined angle. 2b connected to the outlet pipe 11 of the outlet pipe 11 and the suction pipe 31 of the compressor 3 and the insertion pipe 2b extending from the outlet light 11 of the evaporator 1 and inserted into the body 2a. ). The orifice 2c is formed in the lower end of this insertion pipe 2b. In the conventional accumulator 2 having such a structure, the following formation of bubbles and bursting of bubbles occur during operation or stop of the compressor 3. In addition, a muffler 40 is provided at the inlet side of the compressor 3. The muffler has an inlet port 4a and an outlet port 4b formed at the same height, and a body of a simple expansion type 4c integrated therewith. The outlet port 4b of the muffler 4 and the suction side of the compressor 3 are connected by one connecting pipe 32. Here, the muffler 4 is connected to the suction side of the compressor 3. It is connected by one connecting pipe 32. Here, the muffler 4 acts as a silencer to attenuate the noise transmitted from the compressor 3, and liquid refrigerant or oil is directly connected to the suction valve (3) of the compressor (3). (Not shown).

In the conventional refrigerator, bubbles are generated as the gaseous refrigerant is discharged into the liquid refrigerant containing oil filled in the accumulator 2 through the orifice 2c formed at the lower end of the insertion tube 2b during operation of the compressor 3. And popping phenomenon occurs. However, the noise at this time is not a big problem because it occurs in the state in which various noise sources of the compressor and the fan are operating.

When the temperature in the refrigerator drops to a certain level (set value) through the operation of the compressor and the evaporator of the refrigerant in the evaporator, the compressor and most of the driving units are stopped. However, the refrigerant, which is a working fluid, is continuously driven by the pressure difference between the high compression pressure and the low compression pressure on the cycle formed during the operation of the compressor, which causes bubble noise in the accumulator 2. There are two types of bubble noise observed. One is shown immediately after the compressor 3 stops, and since the pressure difference between the high pressure side and the low pressure side is large, bubble noise is also greatly generated. This bubble noise is generated in the process of supplying the refrigerant and oil remaining in the evaporator 1 into the accumulator 2 by the force generated from the high pressure side. The other occurs when the pressure gauge 3 is stopped 2-3 minutes later, that is, when the pressure balance of the cycle is almost reached and only a slight pressure difference exists. The direct cause thereof is the lower end of the insertion tube 2b. It was found that the influence by the orifice 2c formed thereon was quite large. At this time, in the process of recovering the liquid refrigerant in the accumulator 2 toward the evaporator 1 through the orifice 2c by its own weight, a part of the liquid refrigerant is inserted into the insertion tube 2b due to the slight pressure difference between the high pressure side and the low pressure side. Bubble noise is generated in the process of being loaded into the gaseous refrigerant supplied into the accumulator 2 and supplied into the accumulator 2 again.

As described above, in the conventional accumulator, there is a problem that bubble noise occurs not only during the operation of the pressure gauge but also when the pressure gauge is stopped, in particular, even when the pressure balance of the high pressure side and the low pressure side is almost made after the pressure gauge is stopped. In addition, since the liquid refrigerant and oil, which have not been evaporated and are delivered to the intake side of the pressure gauge, are stored in the muffler and directly flowed into the intake valve of the compressor, the efficiency of the compressor may be reduced due to the rapid increase of the liquid refrigerant and oil on the compressor side. There was a problem, it was difficult to recover the oil accumulated in the lower end of the muffler when the compressor operation for a long time, there was a problem that the operating conditions worsened. Therefore, the present invention is to solve this problem, the main object of the present invention is to provide a low noise refrigerator to reduce the generation of bubble noise when the compressor is stopped, especially when the pressure difference between high compression and self-compression after the compressor is small.

Another object of the present invention is to provide a low noise refrigerator capable of preventing liquid refrigerant and oil from directly flowing into the suction valve of the compressor during operation of the compressor.

Still another object of the present invention is to provide a low-absorption refrigerator capable of recovering oil accumulated at the bottom of the muffler when the compressor is operated for a long time, thereby improving operating conditions of the compressor.

In order to achieve this object, the present invention provides a refrigerator in which an evaporator and a compressor are connected by a refrigerant pipe, an accumulator is installed at an outlet of the evaporator, and a muffler is installed at an inlet of the compressor, wherein the accumulator is connected to the body and the body. It includes an insertion tube is inserted into the body of the outlet tube of the evaporator extends into the insertion tube, the insertion tube is formed so as to guide the refrigerant passing through the outlet tube is supplied to the body only through the end of the insertion tube, The muffler includes a body, an inlet port formed on an inlet side of the body and an upper outlet port provided up and down on an outlet side of the body, wherein the upper outlet port communicates with the compression chamber of the compressor and the lower shaft outlet port is a margin of the compressor. Characterized in communication with the space.

Hereinafter will be described an embodiment of the present invention with reference to the accompanying drawings.

Since the general configuration of the refrigerator to which the present invention is applied is the same as that of FIG. 1, description thereof will be omitted. 3 schematically shows the structure between the accumulator 20 and the pressure gauge 30 located on the refrigerant outlet side of the evaporator 1. Referring to this, the evaporator 1 and the compressor 3 are connected by a refrigerant pipe. An accumulator 20 is disposed at an outlet side of the evaporator 1 at a predetermined angle with respect to the evaporator 1, and a muffler 40 is disposed at an inlet side of the compressor 3. The accumulator 20 is connected to the outlet tube 11 of the evaporator 1 on one side and extends from the outlet tube 21 and the outlet tube connected to the suction tube 31 of the compressor 3 on the other side into the body 21. And an insertion tube 22 inserted.

The end 22a of the insertion tube 22 is bent upward, and the bending angle 2 is 20 degrees-35 degrees. The distance P from the bending end 22a of the insertion tube 22 to the inner surface of the trunk 21 is maintained at least 20 mm. In addition, the ratio of the length (Y) to the outer diameter (X) of the body (21) maintains 1.3 or less. This dimensional structure is such that the end of the insertion tube is located as far as possible from the inlet side of the suction tube 31, so that the compressor through the liquid coolant insertion tube 22 remaining in the evaporator 1 at the initial start of the compressor 3 is compressed. This is to accumulate in the accumulator (20) without directly flowing to (3).

In addition, unlike the orifice is formed in the lower end of the conventional insertion tube there is no orifice in the embodiment of the present invention. This reduces bubble noise generated in the process of inflow of the liquid refrigerant and oil remaining in the accumulator in the accumulator when the compressor 3 is stopped, and the liquid refrigerant and oil flows back toward the evaporator 1. In this case, the liquid refrigerant and oil remaining in the evaporator 1 at the initial stage of restarting the compressor 3 do not accumulate in the accumulator 20 and flow into the compressor 3 immediately after the insertion tube 22 is soaked. This is to prevent performance deterioration and noise increase due to excessive influx of liquid refrigerant and starting fluid.

On the other hand, an end film 23 is formed at the end 22a of the insertion pipe 22, and a plurality of discharge holes 24 having different sizes are arranged in the end film 23. This is to prevent the liquid refrigerant and oil from flowing straight into the compressor 3 at the initial start of the compressor 3, and also to minimize the noise due to the resonance caused by the bursting of the bubble. In general, noise caused by bubbles generated in the accumulator when the compressor 3 is stopped is directly affected by the diameter of the insertion tube and the discharge pressure on the high-entry side. Accordingly, when the diameter of the insertion tube is determined under the same pressure and temperature conditions, the bubble The magnitude of is determined and, as a result, the noise frequency. In the conventional accumulator structure, since the end membrane 23 and the discharge holes 24 having different sizes are not the same as in the embodiment of the present invention, when the bubble size is distributed intensively in a constant size and the bubble becomes large, Resonance occurs, increasing overall noise. However, in the present invention, the amount of generation of bubbles is minimized by the end membrane 23 and at the same time, when the bubbles generated by the discharge holes 24 of different sizes are increased, the noise frequency is also different, thereby minimizing the amount of noise.

Next, the coupling structure of the muffler 40 and the compressor 3 will be described. As illustrated in FIG. 5, the muffler 40 includes a body 41 and an inlet port 42 formed on an inlet side of the body 41 and an upper outlet port 43 provided up and down on an outlet side of the body 41. And a lower outlet port 44. The upper side flow port 43 communicates with the compression chamber 34a of the compressor 3, and the lower side outflow port 44 communicates with the free space 35 of the compressor 3. The compressor 3 includes a cylinder block 34 forming a compression chamber 34a in the cell 33, a piston 36 reciprocating the compression chamber 34a to perform a compression operation of the refrigerant, and the piston ( A driver 37 for driving 36 is mounted. The space excluding the driving unit 37 and the cylinder block 34 in the cell 33 is defined as a clearance 35 in the present specification. The upper shaft outlet fork 44 of the muffler 40 is connected to the compressor 3 by the upper shaft connecting pipe 38 and communicates with the compression chamber 34a through a suction valve (not shown) inside the compressor 3. . On the other hand, the lower outlet port 43 of the muffler 40 is connected to the compressor 3 through the lower connection pipe 39 and communicates with the above-mentioned clearance 35 in the compressor 3.

Therefore, the gaseous refrigerant passing through the accumulator 20 passes through the upper outlet port 43 and the upper connecting pipe 38 and is sucked into the compression chamber 34a via the suction valve of the compressor 3. On the other hand, the liquid refrigerant and oil, which are frequently generated at the beginning, are introduced through the inlet port 42 of the muffler 40 and accumulated at the lower end of the muffler 40, and then inside the compressor cell 33 through the lower side of the muffler port 44. It is supplied to the free space 35 of the. Accordingly, since the liquid refrigerant and oil do not directly flow into the compression chamber, it is possible to prevent the compressor from decreasing in efficiency due to an increase in load.

In addition, the noise generated when the suction valve of the compressor 3 is trembling can be reduced by the extinction interference between frequencies in the muffler 40. That is, the noise generated from the intake valve has a constant direction and comes out through the connecting pipes 38 and 39 to reach the muffler 40 to be reduced by the extinction interference.

In addition, since the compressor 3 is operated for a long time, oil is accumulated at the bottom of the muffler 40. Thus, the accumulated oil is recovered into the compressor 3 through the lower outlet port 44, thereby improving the operating conditions of the compressor. It can be effective.

In addition, by removing the orifice in the insertion tube, it reduces bubble noise generated during the inflow of the liquid refrigerant and oil remaining in the accumulator to the evaporator when the compressor stops operating.In the case of the liquid refrigerant and the oil flowing back to the evaporator, The liquid refrigerant and oil remaining in the evaporator do not accumulate in the accumulator and flow directly to the compressor through the insertion tube, thereby preventing the performance degradation and noise increase due to the excessive inflow of the liquid refrigerant and oil at the initial startup of the compressor.

Claims (1)

In the refrigerator of the compressor of the evaporator is connected by a refrigerant pipe, the accumulator is installed on the outlet side of the evaporator and the muffler is installed on the inlet side of the compressor, the accumulator is inserted into the body and the outlet tube of the evaporator extends into the body. It includes an insertion tube, wherein the insertion tube is formed so as to guide the refrigerant passing through the outlet tube into the body only through the end of the insertion tube, the muffler and the inlet formed on the inlet side of the body A port and an upper outlet port and a lower outlet port provided up and down on an outlet side of the body, wherein the upper outlet port is in communication with a compression chamber of the compressor and the lower outlet port is in communication with a free space of the compressor. Low noise refrigerator.